Negative impact of traffic noise on avian reproductive success

Journal of Applied Ecology - Tập 48 Số 1 - Trang 210-219 - 2011
Wouter Halfwerk1, Leonard J. M. Holleman2, C. M. Lessells2, Hans Slabbekoorn1
1Behavioural Biology, Institute of Biology, Leiden University, 2333 BE Leiden, The Netherlands
2Netherlands Institute of Ecology (NIOO‐KNAW), 6666 ZG Heteren, The Netherlands

Tóm tắt

Summary1. Traffic affects large areas of natural habitat worldwide. As a result, the acoustic signals used by birds and other animals are increasingly masked by traffic noise. Masking of signals important to territory defence and mate attraction may have a negative impact on reproductive success. Depending on the overlap in space, time and frequency between noise and vocalizations, such impact may ultimately exclude species from suitable breeding habitat. However a direct impact of traffic noise on reproductive success has not previously been reported.2. We monitored traffic noise and avian vocal activity during the breeding season alongside a busy Dutch motorway. We measured variation in space, time and spectrum of noise and tested for negative effects on avian reproductive success using long‐term breeding data on great tits Parus major.3. Noise levels decreased with distance from the motorway, but we also found substantial spatial variation independent of distance. Noise also varied temporally with March being noisier than April, and the daytime being noisier than night‐time. Furthermore, weekdays were clearly noisier than weekends. Importantly, traffic noise overlapped in time as well as acoustic frequency with avian vocalization behaviour over a large area.4. Traffic noise had a negative effect on reproductive success with females laying smaller clutches in noisier areas. Variation in traffic noise in the frequency band that overlaps most with the lower frequency part of great tit song best explained the observed variation.5. Additionally, noise levels recorded in April had a negative effect on the number of fledglings, independent of clutch size, and explained the observed variation better than noise levels recorded in March.6. Synthesis and applications. We found that breeding under noisy conditions can carry a cost, even for species common in urban areas. Such costs should be taken into account when protecting threatened species, and we argue that knowledge of the spatial, temporal and spectral overlap between noise and species‐specific acoustic behaviour will be important for effective noise management. We provide some cost‐effective mitigation measures such as traffic speed reduction or closing of roads during the breeding season.

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Journal of Applied Ecology

Tập 48 Số 1

210-219

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